Stairwell Roof Fire Rating

Fire ba rri er wal ls shall ext end f rom the top of the floor cei ling assembly below t o the under side of the floo r or roof slab or deck abo ve and shall be securely attached thereto.

Stairwell roof fire rating.

Openings in the roof shall not be located within 4 feet 1220 mm of the fire wall. The lower roof assembly within 4 feet 1220 mm of the wall has not less than a 1 hour fire resistance rating and the entire length and span of supporting elements for the rated roof assembly has a fire resistance rating of not less than 1 hour. Fire and sound selector fire and sound ratings fire ratings fire resistance is the ability of an assembly constructed in a laboratory to contain a fire in a carefully controlled test setting for a specified period of time. If stairwell doors do not allow for reentry and a stairwell becomes impassible it can jeopardize the lives of those using the stairwell as a means of egress.

05 31 06 706 4 co ntinuity o f fire ba rrier w alls. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c. Stairs terminating at the level of a setback shall. Vertical exit enclosures four stories or mor e shall be 2 hour fire resistance rat ed.

On this building the ibc allows for a rated lid as long as it matches the rating of the vertical walls ibc 2009 section 708 12. In buildings four or more stories or more than 40 feet 12 192 mm in height above grade one stairway shall extend to the roof surface through a stairway bulkhead complying with section 1509 2 unless the roof has a slope steeper than 20 degrees 0 35 rad access to setback roof areas may be through a door or window opening to the roof. The number of stories shall be co mp uted as al l f loor lev els i ncludi ng bas ements but ex cludi ng mezzan ines. Astm e119 standard test methods for fire.

Ver tical exit enclosur es les s than f our stor ies shall be 1 hour f ire resistance rated. 06 06 2003 edition issued. Interior exit stair ways shall be enclosed. The term stairwell reentry refers to the code requirements which allow a building occupant to leave a stairwell during a fire emergency and find another exit.

Over non combustible roof decks such as steel poured gypsum or concrete only the spread of flame on the top surface of the roof system is evaluated. What i found is still somewhat inconclusive.